Parameter‐Adaptive Control Method in Left‐Side Power Point Tracking Mode for Single‐Stage Photovoltaic Power Generation Systems

ABSTRACT The flexible power point tracking (FPPT) strategy is designed to address frequency regulation resource shortages in modern power systems. However, it introduces power quality challenges in single‐stage photovoltaic generation systems (PVPGS) operating on the left side of the P–V curve. Specifically, non‐smooth AC power responses characterised by reverse power spikes and steady‐state ripple occur during dynamic operation. This work develops a small‐signal model of the PVPGS topology to identify stable operating regions through eigenvalue analysis, revealing an inverse power relationship between PV arrays and DC capacitors during left‐side FPPT. Leveraging these insights, a parameter adaptation method is proposed to enhance AC output smoothness without hardware modifications or FPPT algorithm alterations. Simulation and experimental results verify the proposed method's effectiveness in suppressing AC power reverse spikes, demonstrating a minimum 40% reduction in peak reverse power magnitude and 59% attenuation in average spike amplitude while maintaining grid‐compliant steady‐state operation.